... on the power switch, through the mode switch key-press button to set up braze welding, shows q_X, and according to the specifications of the welding material, choose the ... welding, dismantle the welding material, and then carry on the next welding.4. Control panel button operation:a) In stand ... welding, braze welding, backfire welding, press this button a long time, only respond one time (X shows input ...